Oes to edwin haeeington



J. SPROGBLL 8u H. S. HASKINS'.

HOISTING MACHINE. v

Patented Aug. 18, 188.5.-

(No Model.)

u. versus. mvmingnphr. wnmngmn. n.0.

UNITED STATES PATENT OFFICE.

JOHN SPROGELL AND HARRY S. IIASKINS, OF PHILADELPHIA, PA., ASSIGN- ORSTO EDWIN HARRINGTON, SON 8L CO., OF SAME PLACE.

HOISTING- JPECIE'ICATION forming part of Letters Patent No. 324,425,dated August 18, 1885.

To all whom it may concern: v

Be it known that we, JOHN SPROGELL and HARRY S. .HAsKINs, both of thecity and county of PhiladelphiaJ and State of Pennsyl- Vania, haveinvented an Improvement in Hoisting-Machines, of which the following isa specification.

Our invention has reference to hoisting-machines; and it consists in ahoisting-machine provided with two brakes, one of which is adapted to beautomatically applied upon any attempt of the elevator to run down, andthe other of which is adapted to be applied only by hand when it isdesired to arrest the rotation of the cable-pulley or descent of thecage; further, in the said construction, combined with asingle operatingrope or rod, by which the action of eithei` of said brakes may becontrolled at will; further, in combining the said brakes and couplingthem together in such a manner that when one is applied the other isremoved, and vice versa, and in many details of construction, all ofwhich is set forth in the following specification and sho wn in theaccompanying drawings, which form part thereof.

Heretofore elevators have been made with a single brake, which isinotapplied except when the brake-cord is pulled, and in ascending ordescending should the operating-rope become broken the cage tends tofall rapidly, and it is practically impossible for the operator toquickly arrest the descent thereof; further, in descending it isdifficult to arrest the cage or platform, particularly when heavilyloaded, even with the door, so that the contents may be removed from theplatform to the door Without being raised or allowed to fall.'Hand-elevatorsas commonly made, if heavily loaded, would run downrapidly, and therefore require some one to stand by the brake-rope andkeep it applied to prevent injury or breakage.

The object of our invention is to provide means by which theelevator-cage cannot descend faster than the operator who may be on thecage desires, the descent being wholly under his control, as thebrake-rope hangs loosely by the side of the cage, and in descending heholds the same by a gentle pressure, by which 5o both brakes are removedfrom the brakewheel. If he wish to reduce the speed of the elevator, hepulls upon the brake-rope with any pressure desired, and if he shouldwish to stop the cage in front of any door he simply lets go of the saidbrake rope, and one of the brakes is automatically applied and arrestsany further descent of the cage positively, but'not abruptly, inpractice it being very easy to bring the platform exactly level with thefloor at which it is desired to arrest its 6o descent. In addition tothis, if the hoistingrope should become broken in raising the elevatorone of the brakes is automatically applied, almost instantly arrestingthe descent of the cage, and thereby preventing any accident whatsoever.

In the drawing is shown an elevation of a hoisting apparatus embodyingour invention.

A is the cage. B are the guides therefor. A is the cable which raises orlowers the cage. This cable passes over the lifting-sheave C, and may beattached at its free end with a counterbalance-weight in the usualmanner. This sheave C is secured to a shaft, D, journaled in the frameE, and which also carries secured to it the spur-gear F, which mesheswith a pinion, G, secured to or on the same shaft which carries thehoisting-rope sheave I, over which the hoisting-rope J passes, and towhich the brake-wheel surface K is preferably secured.

M is the brake-lever, being pivoted to the frame E, and provided with abox, O', in which the wooden brake-shoe O is secured. This lever isprovided with a counterbalance-weight, m, and is operated by thehand-rope N.

P is the auxiliary brake-shoe, and is pivoted von the pin Q, whichpasses through the slot p. This shoe is provided with a heel, P',clamped in position by a plate, P2, and which heel is preferably formedof rawhide; but may be formed of any other material, if so desired,rawhide being more preferable, as it creates less noise. This auxiliaryshoe P is coupled to an extension, M', of lever M by a 95 link, M2, sothat` any movement of one shoe must necessarily cause a movement in theother shoe, but in opposite directions-that is to say, if the shoe O isapplied to the brakewheel the shoe P is removed from same, and viceversa. 10o

The shoe P is provided with a lever-extension, P3, which rests againstthe piston t, 'secured to the rod T, and which works within the cylinderS, being pressed toward the lever P by a spring, S', having its movementcontrolled by an adj ustingnut, T. This pressure apparatus is designatedby R. Freni this it is seen that the spring S opposes the action of 'theweight m, and is made of such strength as is just capable of raising thesaid weight and withdrawing the shoe O away from contact with thebrake-wheel. From this it is seen that if the rope J be pulled asindicated by the arrow, the friction created between the heelextensionP' of the shoe P and the brakewheel will tend to throw the said shoeinto the position shown, in which both of the brakeshoes are practicallythrown out of contact with the brake-wheel, the cage being in its upwardmovement. If, now, the cage A be on the descent, the reversal of thedirection of movement of the brake wheel will naturally raise up theheel-extension, owing to the friction and assistance of the spring S,and cause said shoe P to clamp upon the brakewheel, tending to arrestany further descent of the cage.

To prevent the cage being arrested, it is simply necessary to hold uponthe rope N with a gentle pressure, just sufficient to prevent the saidfriction between the brake-shoe heel and brake from drawing thebrake-shoe P down against the brake-wheel proper.

If it is desired to reduce the rapidity of descent, it simply becomesnecessary to pull upon the brake-rope N with a greater or less force,which action causes the brake-shoe O to be pressed in contact with thebrake-wheel with a greater or less pressure.

In this construction to arrest the descent of a cage it would becustomary to free the brake-rope, whereas in all other constructions ofelevators it is customary to pull hard upon the brake-rope; also, whenpulling down the brake-rope of this machine gently both brakes arepractically removed, while such an action in elevators as commonlyconstructed would be to apply the'brake, and it is upon these radicaldifferences that the essential feature of the invention is based, theparticular means shown to accomplish the result being immaterial to ourinvention.

Tn place of the spring-piston and cylinder,

which acts upon the brake-shoe P, the said shoe may be actuated by alever and weight, as shown at T2, as the saine result would beaccomplished thereby, though not in quite so satisfactory a manner.

The slot p of the shoe P allows the said shoe to be pressed away fromthe brake-wheel more orless as required, to allow for any irregularityin the said wheel, and by this construction preventing any possibilityof a binding action in the ordinary running of the machine. v

Vhile we prefer the construction shown, we do not limit ourselves to thedetails thereof, as they may be modified in various ways with outdeparting from our invention.

Having now described our invention, what we claim as new, and desire tosecure by Letters Patent, is- Y l. In an elevator, the combi nation of abrakewheel, brake shoe O O', lever M, cord N, weight m, link M2, shoe P,having heelextension P, and a spring or weight to press said shoe Ptoward the brake-wheel a-nd the shoe O O away from said brake-wheel,substantially as and for the purpose specified.

2. The combination of brake-wheel K, shoe P, having heel-extension P',pistou t'l, spring S', and cylinder or case S, substantially as and forthe purpose specified.

3. The combination of brake-wheel K, shoe P, having heel-extension P',piston t T, ad justing-nnt T, spring S', and cylinder or case S,substantially as and for the purpose specified.

4. The combination of brake-Wheel K, with shoe P, having aheel-extension, P', made adjustable upon said shoe, substantially as andfor the purpose specified.

5. In an elevator, two brake-shoes coupled together so that when one isapplied the other is removed, in combination with weights or springs, orboth, acting upon each of said shoes 9 5 IOO

